Driving gear-wheel for music-sheets.



A. JUNGHANS. DRIVING GEAR WHEEL EOE MUSIC SHEETS.

APPLIOATION FILED 0013.9. 1902.

, UNTTED STATES Patented January 3, 190 5.

PATE T Orrrcn.

ARTHUR JUNGHANS, OF SCHRAMBERG, GERMANY.

DRIVING GEAR-WHEEL FOR MUSIC-SHEETS.

SPECIFICATION forming part of Letters Patent No. 779,165, dated January 3, 1905.

Application filed October 9, 1902. Serial No. 126.590.

1'0 (711M whom it may concern.-

Be it known that I, ARTHUR JUNGHANS, a

- citizen of the Empire of Germany, residing at rated sheets or disks of self-playing musical,

instruments.

The cog-wheels for propelling perforated musical sheets or disks of automatic musical instruments should present a smooth and bright surface throughout for the sake of an attractive appearance and also for preventing the accumulation of dust and other foreign matters. This requirement has hitherto been satisfied by making the cog-wheels from a cast blank by forming the teeth thereon after the casting by turning and cutting or routing the same in such a way as to leave a circular row of teeth projecting from the same or by inserting previously-manufactured teeth into the wheelbody, which had been previously worked on the lathe. This tedious manipulation of the cog-wheels as heretofore made and the cutting out or insertion of the teeth into the wheel-body not only causes a great loss of time, but could be carried out only by' skilled mechanics.

The present invention is designed to overcome these objections; and it consists mainly in a gear-wheel for the purpose stated.which has been prepared by simple pressing and stamping from sheet metal, so that the gearwheel when prepared from smooth and bright sheet metal will also be smooth and bright. It should be stated in this connection that the smooth cog or gear wheels, which are'also stamped from sheet metal, are essentially different from a gear-wheel made according to the present invention, inasmuch as the breadth of the teeth of such cog-wheels is equal only to the thickness of the sheet metal employed, while the teeth of the wheel made according to this invention may have any desired breadth.

A gear-wheel according to this invention is made by taking a circular disk of sheet metal and stamping or drawing the same into a cup shaped body and thereupon cutting from the cylindrical flange or rim of this cupshaped bodythe teeth of the gear-wheel and pressing themoutward. This cup-shaped body is then or at any suitable time provided with a' hub. It will be readily seen that when the material employed is smooth and polished the'completed gear-wheel resulting from the above operation will also be smooth and polished.

In the accompanying drawings, Figure 1 represents a plan view of a driving gear wheel for music-sheets made according to my invention, the same being represented as engaging the corresponding perforations in a music-sheet in part. Fig. 2 represents an end view of the said gear-wheel; Fig. 3, a somewhat-modified form of gear-wheel under my invention in end elevation, and Fig. 4 a side elevation of the same.

From the drawings it will be seen that a cogwheel made according to my invention consists of a cup-shaped body portion 5 drawn or stamped from sheet metal, or in some instances cast, the said cup-shaped portion being provided with a hub an, attached thereto in any suitable manner. The body portion Z) is provided with the rim or flange c, from which, as shown, project the cog-teeth (Z,

which are adapted to engage with the driving-apertures a of the music-sheetf, as shown in Fig. 1. The teeth d are formed by cutting tongues at regular intervals in the rim 0 and then forcing these tongues out, as shown, the cutting and forcing operation being carried out by any suitable tools or machinery. It will be noted from the drawings that the tongues forming the teeth (Z project beyond the rim obliquely, the base of these teeth being preferably parallel to the axis of rotation of the cog-wheel. Since the cog-wheel works only in one direction, it is of no moment and does not in any way interfere with the operation of the cog-Wheel that the teeth are undercut on the side opposite to their working or pitch surface.

The working or pitch surface of the teeth is represented as a plane surface in. Figs. 1 and 2, While in Figs. 3 and 4 the pitch surface is represented as curved or rounded in the direction of the axis of the cog-Wheel. If desired, the pitch surface of these teeth may be curved also in the direction of the length of the teeth in a manner generally carried out in gear- Wheels.

l/Vhat I claim, and desire to secure by Letters Patent of the United States, is-

1. In a gear-wheel for driving music-sheets and the like, a cylindrical sheet-metal body provided with teeth projecting substantially at right angles to the axis of the cylindrical body and inclined to the radii of the cylindrical rim at the respective points of contact.

,2. A gear-Wheel for driving music sheets or disks consisting of a cupshaped sheetmetal body provided with tongues projecting from the rim thereof at substantially right angles to the axis of the body and inclined to the radii of the rim at the respective points of contact.

3. A gear-Wheel for driving music sheets or disks, consisting of a cup-shaped sheetmetal body provided With a hub, the cylindrical rim of the body being provided With concave tongues stamped therefrom and projecting outwardly from the same in a plane substantially at right angles to the axis of the body, said tongues inclined to the radii of the cylindrical rim at the respective points of contact. 4. The combination, with a disk having driving apertures therein, of a gear-Wheel mounted in operative relation thereto, said Wheel consisting of a cylindrical sheet-metal body provided with tongues projecting obliquely therefrom at an inclination opposed to the direction of rotation and arranged to successively engage the apertures.

5. The combination, with a disk having drivingapertures therein, of a gear-Wheel mounted in operative relation thereto, said Wheel consisting of a cup-shaped sheet-metal body provided with tongues projecting from a rim thereof substantially at right angles to the axis of the cylinder and inclined in a direction opposed to the direction of rotation and arranged to successively engage the apertures.

In testimony whereof I aflix my signature in presence of two Witnesses.

ARTHUR J UNGrHANS.

Witnesses:

ANTON A. GLoETzNER, ALBANUS S. T. J OHNSON. 

